qrcode

qrcode

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1 Introduction

qrcode is a software package used to generate a QR code from a string. This software package is a port of RT-Thread based on ricmoo/QRCode open source library.

1.1 Directory structure

Name	Description
examples	Examples directory, and some corresponding instructions
inc	Header file directory
src	Source Code Directory

1.2 License

The qrcode software package extends the QRCode software package license agreement, please see the qrcode/LICENSE file.

1.3 Dependency

• RT-Thread 3.0+

2. How to open qrcode

To use qrcodepackage, you need to select it in the package manager of RT-Thread. The specific path is as follows:

RT-Thread online packages
    tools packages --->
        [*] qrcode: A simple library for generating QR codes in C
            [*] Enable qrcode sample

• Enable qrcode sample: Enable QR code sample;

Then let RT-Thread's package manager automatically update, or use the pkgs --update command to update the package to the BSP.

3. Use qrcode

Generate QR code

When using the qrcode software package, you must first define a structure to manage the QR code.

QRCode qrcode;

Then apply for dynamic memory according to the version number to save the generated QR code,

uint8_t *qrcodeBytes = (uint8_t *)rt_calloc(1, qrcode_getBufferSize(DEFAULT_QR_VERSION));

Finally, use the QR code generation function to generate the QR code.

qrcode_initText(&qrcode, qrcodeBytes, DEFAULT_QR_VERSION, ECC_LOW, "HELLO WORLD");

Print QR code

The generated two-dimensional code is dot matrix data, 8 dots constitute a Byte. The following codes can be used to display the QR code

for (uint8_t y = 0; y <qrcode.size; y++) {
    for (uint8_t x = 0; x <qrcode.size; x++) {
        if (qrcode_getModule(&qrcode, x, y)) {
            rt_kprintf("**");
        } else {
            rt_kprintf(" ");
        }
    }
    Serial.print("\n");
}

4. Demo

In this example, the QR code routine needs to be opened in the qrcode software package.

Enter the command qrcode RT-Thread in MSH, you can print out a QR code on the serial port assistant, scan it with the mobile phone code scanning software, you can see the result is RT-Thread.

5. Matters needing attention

• When generating a QR code, the higher the version used, the larger the dynamic memory that needs to be applied for.
• When scanning the QR code on the serial port assistant, pay attention to setting the serial port assistant with black characters on a white background.
• When scanning the QR code on the serial port assistant, pay attention to reducing the text display to reduce the space between *.

6. Contact & Thanks

• Maintenance: qgyhd1234
• Homepage: https://github.com/RT-Thread-packages/qrcode